JPS6121227A - Method and device of decreasing generation of noise during hammering of steel pile - Google Patents

Abstract

PURPOSE:To decrease the generation of noise without using a cover for a steel pipe, by a method wherein, when the steel pile is driven, hammering is effected in a condition in that the interior of the steel pile is full of water, and water at the interior is caused to flow out through a drain hole along with setting of the steel pile. CONSTITUTION:The interior of a steel pipe pile 8 is filled with water 11, a drain cap 13 is attached to the upper part of the steel pipe pile 8, and a low noise cap 4, a cushion 3 made of wood, and a hydraulic hammer ram 2 are located above the cap. When, with the hydraulic hammer 2 actuated, the steel pipe pile 8 is driven, the water 11 in the steel pipe pile flows out through a drain hole 13a along with setting of the steel pipe pile 8, and is recovered to a water collection tank 15 through a hose 14. This enables decrease in the generation of noise during driving of the large and long steel pile.

Description

[Detailed Description of the Invention] The present invention uses a low-noise hydraulic pile hammer, diesel hammer, etc. to produce various types of steel piles such as steel pipe piles and steel sheet piles in low quantities. )
- A method for reducing noise when striking a steel pile and its Hi-F
This applies to f.

Steel pile driving! II? The noise No. 7 is a combination of the sound generated from the hammer itself and the vibrationless sound generated from the steel pile itself due to impact, resulting in a large noise C. In order to prevent the generation of this noise and achieve the level below the regulation value of the Noise Control Act (85 phon or less at a distance of 30 m from the boundary of the neighboring property), in the case of a diesel hammer, not only the source of the blow but also the entire steel pile itself must be surrounded with a soundproof cover. Required large-scale equipment. In view of this, the present inventors first devised a low-noise striking device for steel piles using a low-noise hydraulic pile hammer,
I applied as No. 7. This device includes a hydraulic hammer having a soundproof cover, a soundproof cover that covers the upper half of the low-noise cap that contacts the hydraulic hammer through a wooden cushion, and a lower end of the low-noise cap. Each step is equipped with a protective plate with guide ribs fitted to the upper end of the steel pile so as to be in contact with the lower wooden cushion inside the cap for the steel pipe.

Figure 1 shows one example, 1 is a soundproof cover, 2 is a hydraulic hammer ram, 3 is an upper wooden cushion, 4 is a low noise cap, 5 is a lower wooden cushion, 6 is a protection plate, 7 is a protection plate 6 is a fixed guide rib, 8 is a steel pipe pile, 9 is a cushioning material, 10 is a cover piece made of rubber or the like, and 18 is a cap for the steel pipe. By using this device, it has generally become possible to reduce noise. However, if the exposed length of the steel pile exceeds 7 m, the resonance noise of large-diameter steel piles will exceed the regulation value of the Noise Control Law (98.8 m) even with this device.
There is a drawback that it becomes (to the extent of Hong Kong).

The present inventors used bundling, a low-noise hydraulic pile hammer, a diesel hammer, etc., which have been used in various experiments to prevent the generation of resonance noise in large-diameter steel piles, by applying water to the hollow part of the steel pile and hitting it. In particular, even if a soundproof cover is not used on the exposed length of the steel pile, for example, if the diameter is 1,000 mm,
It has been discovered that a material with a thickness of 12 to 2'2 mm can be poured with noise below the regulation value of 77 to 78 phon.

The present invention is based on the knowledge obtained through these numerous experiments, and it is generally known that filling a container with water changes the sound generated when the container is hit. This could only be done under certain conditions.

(1) Use a low-noise striking device such as a low-noise hydraulic pile hammer. The device consists of a soundproof hammer similar to a hydraulic hammer or a diesel hammer with a soundproof cover, and a low-noise cap that is attached to the soundproof hammer via a cushion and whose upper half is covered by the soundproof cover. It is.

(2) Release water pressure to the outside. Therefore, use a water drain cap or, in the case of upper piles, provide a drain hole directly in the steel pile body. (However, only when the upper end of the pile is cut) As the steel pile sinks, the water inside is drained over 70 mm and collected in a water tank for reuse.

(3) An air layer is provided at the upper end of the hollow part of the steel pile to prevent a sudden increase in water pressure due to impact. Therefore, consider the location of the drain hole.

A few examples of implementing the present invention will be described below with reference to the drawings.

FIG. 2 is a partial sectional view of a device showing a first embodiment of the present invention.
A drainage hole 8a is provided at the upper part of the face of the steel pipe pile □ This shows the same device as shown in Figure 1 when used near a river. of,
Further, 12 indicates an air layer above the water 11. As the pile sinks, water 11 overflows from the drain hole 8a, falls along the pile, and flows into the river. Although providing a drainage hole at the top of a steel pipe pile poses a strength problem, it is convenient to use an existing low-noise hydraulic pile, so it is used in the case of an upper pile whose top end is cut off after settling.

FIG. 3 is a partial sectional view of a device showing a second embodiment of the present invention.
As in Fig. 2, the water 11 pumped up from the river and placed in the steel pipe pile 8 overflows and flows into the river.In the second embodiment, as is clear from the comparison with Fig. 2, The noise cap 40T side does not have a steel pipe cap 18 provided with a lower wooden cushion 5 and a protective plate 6 with guide ribs, and also does not have a drain hole 8a in the upper part of the steel pipe pile 8. Instead, a drain cap 13 fixed to the lower part of the low-noise cap 4 is provided, a drain hole 13a is provided in a part of the drain cap 13, and a guide ring 13b and a water scattering prevention plate 13C (guide ring) are provided on the outer periphery. -C is provided in the part where there is no ring. In this case, if a drain cap that matches the dimensions of the steel pipe pile 8 is prepared as a set, it can be used regardless of whether it is an upper pile or an upper pile.

FIG. 4 is a partial sectional view of a device showing a third embodiment of the present invention.
This is a case of construction in an urban area. The drain cap 13 is used in the same way as in FIG.
3d and lead it to the water receiving tank 15 via the hose 14 for reuse. A guide ring 13b is provided on the outer periphery of the water drain cap 17, and a water leakage prevention gasket 16 is used, although a water scattering prevention plate is not necessary. Note that 17 is an air vent hole.

The effects obtained by the present invention are as follows.

(1) The simple method and equipment of filling the I-pile with water and driving the steel pile while allowing the water to overflow can be used not only for general steel piles, but also for driving steel piles, especially large diameter and long steel piles. It can be constructed without using a cover under the Noise Control Act.

(2) By providing a set of drain caps that are compatible with steel piles of various sizes, construction can be carried out regardless of the type of steel pile.

(3) Construction is easy even in urban areas.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a conventional example, and FIGS. 2 to 4 are partial sectional views showing embodiments of the present invention. The symbols in the drawings indicate the following members, respectively. 1: Soundproof cover 2: Hydraulic hammer ram 3: Upper wooden cushion 4: Low noise cap 5: Lower wooden cushion 6: Protective plate 7: Guide rib 8: Steel pipe pile 9: Cushion material 10: Cover piece 11: Water 12: Air layer 13: Water drain cap 14: Hose 15: Water tank 16: Water leak prevention gasket 17: Air vent hole 18: Cap for steel pipe

Claims (1)

[Claims of Claims] 1. When driving a steel pile, water is filled inside the steel pile and the steel pile is hammered, so that as the steel pile sinks, the water inside overflows to the outside through the drain hole. A method for reducing noise when striking steel piles. 2. When driving steel piles, use a low-noise striking device such as a low-noise hydraulic pile hammer to fill the steel pile with water and leave an air layer at the upper end of the steel pile. A method for reducing noise when striking a steel pile according to claim 1, characterized in that water overflows to the outside through a drainage hole. 3. When driving steel piles, use a soundproof hammer such as a hydraulic hammer with a soundproof cover or a diesel hammer with a soundproof cover, and a low-pressure hammer that comes into contact with the soundproof hammer through a cushion and whose upper half is covered by a soundproof cover. A low-noise striking device consisting of a noise cap is used, and a drainage cap is attached to the bottom of the low-noise cap and comes into contact with the top end of the steel pile, or a steel pipe cap is attached to the bottom of the low-noise cap and directly connected to the cap. A method for reducing noise when striking steel piles, which is characterized by providing drainage holes in each part of the steel piles that are in contact with each other, and also equipped with a water injection device such as a pump and, if necessary, an overflow treatment device such as a water tank. Device. 4. In the drain cap that is attached to the lower part of the low-noise cap and comes into contact with the upper end of the steel pile, a drain hole is provided near the lower end that comes into contact with the steel pile, and water is scattered around the drain hole. 4. The noise reduction device when striking a steel pile according to claim 3, wherein the prevention plate is further provided with a guide ring on the outer periphery of the lower end to fit with the steel pile. 5. In the drain cap that is attached to the lower part of the low-noise cap and comes into contact with the upper end of the steel pile, a drain hole is provided near the lower end where it comes into contact with the steel pile, and a water leak prevention packing is provided around the outer periphery of the lower end. The steel pile hammer according to claim 3, further comprising a guide ring, and an overflow treatment device consisting of a drain port, a hose, and a water tank, which are sequentially connected to the drain hole. Time noise reduction device.